Cryopreserved venous allografts: Effects of immunosuppression and antiplatelet therapy on patency and function

Virginia M Miller, R. Thomas Bergman, Peter Gloviczki, Kelvin G M Brockbank

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Purpose: Experiments were designed to determine the function of the endothelium and smooth muscle in cryopreserved and fresh canine saphenous vein allografts. Methods: Reversed interposition saphenous vein grafts were implanted into the femoral arteries of two groups of dogs: group 1 received one freshly harvested saphenous vein allograft and group 2 received one cryopreserved saphenous vein allograft. The contralateral femoral artery in each group was replaced with a freshly harvested autogenous saphenous vein. Animals received oral cyclosporine alone (n = 3) or in combination with aspirin (325 mg/day; n = 20). Results: Four weeks after surgery, none of the cryopreserved grafts was patent in the group treated with cyclosporine alone. All grafts were patent in animals treated with cyclosporine and aspirin. At 4 weeks, blood flow through cryopreserved allografts was significantly greater than in freshly harvested allografts. Platelet deposition was comparable in cryopreserved and freshly harvested allografts immediately after implantation and at 4 weeks. Rings cut from the grafts were suspended for the measurement of isometric force in organ chambers. α-Adrenergic agonists and endothelin caused concentration-dependent contractions in fresh autografts and allografts. After submaximal contraction with prostaglandin F in these same grafts, calcium ionophore and thrombin caused relaxations in rings with endothelium, and nitric oxide caused relaxations in rings without endothelium. Cryopreserved allografts did not respond to any of the agonists tested. Histologic examination of the tissue indicated smooth muscle cells in cryopreserved grafts; evidence of rejection was observed in all allografts. Conclusion: These results indicate that cryopreserved allografts remain patent with antiplatelet and immunosuppressive therapy in spite of loss of functional smooth muscle.

Original languageEnglish (US)
Pages (from-to)216-226
Number of pages11
JournalJournal of Vascular Surgery
Volume18
Issue number2
DOIs
StatePublished - 1993

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Immunosuppression
Allografts
Saphenous Vein
Transplants
Cyclosporine
Endothelium
Therapeutics
Femoral Artery
Aspirin
Smooth Muscle
Adrenergic Agonists
Dinoprost
Calcium Ionophores
Endothelins
Autografts
Immunosuppressive Agents
Thrombin
Smooth Muscle Myocytes
Canidae
Nitric Oxide

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Surgery

Cite this

Cryopreserved venous allografts : Effects of immunosuppression and antiplatelet therapy on patency and function. / Miller, Virginia M; Bergman, R. Thomas; Gloviczki, Peter; Brockbank, Kelvin G M.

In: Journal of Vascular Surgery, Vol. 18, No. 2, 1993, p. 216-226.

Research output: Contribution to journalArticle

Miller, Virginia M ; Bergman, R. Thomas ; Gloviczki, Peter ; Brockbank, Kelvin G M. / Cryopreserved venous allografts : Effects of immunosuppression and antiplatelet therapy on patency and function. In: Journal of Vascular Surgery. 1993 ; Vol. 18, No. 2. pp. 216-226.
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abstract = "Purpose: Experiments were designed to determine the function of the endothelium and smooth muscle in cryopreserved and fresh canine saphenous vein allografts. Methods: Reversed interposition saphenous vein grafts were implanted into the femoral arteries of two groups of dogs: group 1 received one freshly harvested saphenous vein allograft and group 2 received one cryopreserved saphenous vein allograft. The contralateral femoral artery in each group was replaced with a freshly harvested autogenous saphenous vein. Animals received oral cyclosporine alone (n = 3) or in combination with aspirin (325 mg/day; n = 20). Results: Four weeks after surgery, none of the cryopreserved grafts was patent in the group treated with cyclosporine alone. All grafts were patent in animals treated with cyclosporine and aspirin. At 4 weeks, blood flow through cryopreserved allografts was significantly greater than in freshly harvested allografts. Platelet deposition was comparable in cryopreserved and freshly harvested allografts immediately after implantation and at 4 weeks. Rings cut from the grafts were suspended for the measurement of isometric force in organ chambers. α-Adrenergic agonists and endothelin caused concentration-dependent contractions in fresh autografts and allografts. After submaximal contraction with prostaglandin F2α in these same grafts, calcium ionophore and thrombin caused relaxations in rings with endothelium, and nitric oxide caused relaxations in rings without endothelium. Cryopreserved allografts did not respond to any of the agonists tested. Histologic examination of the tissue indicated smooth muscle cells in cryopreserved grafts; evidence of rejection was observed in all allografts. Conclusion: These results indicate that cryopreserved allografts remain patent with antiplatelet and immunosuppressive therapy in spite of loss of functional smooth muscle.",
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